Sculptured Thin Films

Polo, John A.

doi:10.1007/3-540-29339-6_15

Cited by 4 publications

(4 citation statements)

References 89 publications

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“…Thus, a structurally right/left-handed CSTF of sufficient thickness almost completely reflects right/left-circularly polarized (RCP/LCP) light which is normally incident, but normally incident LCP/RCP light is reflected very little, when the free-space wavelength lies within the Bragg regime. This property has led to the use of CSTFs as circular polarization [5], spectral-hole [6], and Solc [7] filters, among other applications [8,9]. Secondly, CSTFs are porous, and their multiscale porosity can be tailored to allow only species of certain shapes and sizes to infiltrate their void regions [10].…”

Section: Introductionmentioning

confidence: 99%

Empirical Model of Optical Sensing via Spectral Shift of Circular Bragg Phenomenon

Mackay

Lakhtakia

2010

IEEE Photonics J.

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Setting up an empirical model of optical sensing to exploit the circular Bragg phenomenon displayed by chiral sculptured thin films (CSTFs), we considered a CSTF with and without a central twist defect of π/2 radians. The circular Bragg phenomenon of the defect-free CSTF, and the spectral hole in the co-polarized reflectance spectrum of the CSTF with the twist defect, were both found to be acutely sensitive to the refractive index of a fluid which infiltrates the void regions of the CSTF. These findings bode well for the deployment of CSTFs as optical sensors.

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Section: Introductionmentioning

confidence: 99%

Empirical Model of Optical Sensing via Spectral Shift of Circular Bragg Phenomenon

Mackay

Lakhtakia

2010

IEEE Photonics J.

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“…Thereby, the multiscale porosity of such STFs can be tailored to order, to a considerable degree. Additionally, since STFs can fabricated from a wide range of organic and inorganic materials, a wide range of optical properties for the porous material can be delivered [12,13]. Chiral STFs are especially interesting for optical sensing applications, as these support the circular Bragg phenomenon, courtesy of the helical nature of their nanowires [10]; furthermore, they also support more than one mode of SPP wave [14,15,16] which may be usefully exploited for sensing [17].…”

Section: Introductionmentioning

confidence: 99%

On the sensitivity of generic porous optical sensors

Mackay¹

2012

Appl. Opt.

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A porous material was considered as a platform for optical sensing. It was envisaged that the porous material was infiltrated by a fluid that contains an agent to be sensed. Changes in the optical properties of the infiltrated porous material provide the basis for detection of the agent to be sensed. Using a homogenization approach based on the Bruggeman formalism, wherein the infiltrated porous material was regarded as a homogenized composite material, the sensitivity of such a sensor was investigated. For the case of an isotropic dielectric porous material of relative permittivity ϵ a and an isotropic dielectric fluid of relative permittivity ϵ b , it was found that the sensitivity was maximized when there was a large contrast between ϵ a and ϵ b ; the maximum sensitivity was achieved at midrange values of porosity. Especially high sensitivities may be achieved for ϵ b close to unity when ϵ a ≫ 1, for example. Furthermore, higher sensitivities may be achieved by incorporating pores that have elongated spheroidal shapes.

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Section: Introductionmentioning

confidence: 99%

“…Robbie and colleagues reported the first STF with unambiguously determined structure [11]. Since that time, hundreds of research papers, a monograph [4], and many book chapters have been written on STFs [12,13,14,15,16].This article contains a brief description of and the physical phenomenons exhibited by STFs. In many cases, those phenomenons are due directly to the symmetries that the structures of the constituent nanowires break.…”

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confidence: 99%

Thin-Film Metamaterials Called Sculptured Thin Films

Lakhtakia

Geddes

2010

Engineering Materials

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Morphology and performance are conjointed attributes of metamaterials, of which sculptured thin films (STFs) are examples. STFs are assemblies of nanowires that can be fabricated from many different materials, typicially via physical vapor deposition onto rotating substrates. The curvilinear-nanowire morphology of STFs is determined by the substrate motions during fabrication. The optical properties, especially, can be tailored by varying the morphology of STFs. In many cases prototype devices have been fabricated for various optical, thermal, chemical, and biological applications.

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Sculptured Thin Films

Cited by 4 publications

References 89 publications

Empirical Model of Optical Sensing via Spectral Shift of Circular Bragg Phenomenon

Empirical Model of Optical Sensing via Spectral Shift of Circular Bragg Phenomenon

On the sensitivity of generic porous optical sensors

Thin-Film Metamaterials Called Sculptured Thin Films

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